Method of producing diisobutylene using mixed C4

A technology of diisobutylene and isobutylene, applied in the production field of diisobutylene, can solve the problems of high trimer content and low utilization efficiency, etc.

Inactive Publication Date: 2003-04-16
CHINA PETROLEUM & CHEM CORP
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  • Description
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Problems solved by technology

CN1087616A discloses a multi-level fixed-bed series polymerization process of mixed carbon four. The raw materials pass through two or more series reactors successively, and the polymerization reaction is controlled by the reaction temperature. Since no polymerization inhibitor is added, the reaction product is also made Trimer content is high
This patent does not use water or alcohols to improve the selectivity of the polymerization reaction. Instead, it is believed that a small amount of water contained in the raw material will be detrimental to the selective dimerization of isobutylene, which is contrary to the industrialized examples introduced in other documents.
[0005] my country C 4 The resource is abundant, but its utilization efficiency has always been low, and most of them have been used as industrial or civil fuels, and diisobutene as a fine chemical raw material is relatively scarce in the domestic market, so the use of mixed C 4 The production of diisobutene is an efficient use of C 4 An important method of resources

Method used

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  • Method of producing diisobutylene using mixed C4
  • Method of producing diisobutylene using mixed C4

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] use as figure 1 catalytic distillation process.

[0035] mix C 4 Contains 48.5% isobutene and 26.3% n-butene

[0036] Feed amount: 300g / h

[0037] Fixed bed polymerization reactor catalyst loading: 500ml

[0038] Catalytic distillation tower catalyst loading: 200ml

[0039] A polymerization inhibitor (tert-butanol) is added to the raw material, and the molar ratio of the inhibitor to isobutene in the fresh feed is 0.015:1.

[0040] Fixed bed polymerization reaction temperature 50.0°C, reaction pressure 0.65Mpa

[0041] The inlet temperature of the catalytic distillation tower bed layer is 62°C, and the reaction pressure is 0.65Mpa

[0042] The temperature at the top of the separation tower is 104.5°C, which is normal pressure separation

[0043] 185 g / h of polymerized product was obtained from the water washing tower, wherein the C8 content was 93.7%, and the diisobutylene content was 76.9%. The purity of diisobutene obtained from the separation tower is 98.3%. ...

Embodiment 2

[0045] use as figure 2 Tandem fixed bed process

[0046] mix C 4 Contains 48.5% isobutene and 26.3% n-butene

[0047] Feed amount: 300g / h

[0048] The catalyst loading capacity of the first and second fixed bed polymerization reactors are respectively: 500ml and 300ml

[0049] Add appropriate amount of polymerization inhibitor (water) respectively in the feed of the two-stage reactor, the mol ratio of total inhibitor amount and the isobutylene in the fresh feed is 0.02: 1, the add-on amount of the first stage reaction is 70% of total amount .

[0050] The first-stage fixed-bed polymerization reaction temperature is 50.0°C, and the reaction pressure is 1.0Mpa

[0051] The second-stage fixed-bed polymerization reaction temperature is 70.0°C, and the reaction pressure is 1.0Mpa

[0052] Hydrogenation bed temperature: 160°C, hydrogenation pressure 1.0Mpa

[0053] 178g / h of the polymerized product was obtained, wherein the C8 content was 92.3%, the diisobutene content was 7...

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Abstract

A process for preparing diisobutylene from C4 mixture includes such steps as polymerizing reaction of C4 mixture under the existance of catalyst and depressant with two or more stages of fixed-bed reactor, and then separating out diisobutylene. Its advantages are high transform rate (more than 90%), high purity (more than 98%), and high total content of C8 (more than 92%).

Description

technical field [0001] The present invention relates to the production method of diisobutene. Background technique [0002] The application of diisobutylene is very extensive, mainly including: [0003] (1) Production of high-quality plasticizer; (2) Production of t-octylphenol; (3) Synthesis of water-based paint dispersant T. In addition, using mixed acid as the reaction medium, adopting three-pot series continuous reactors, diisobutene can be produced through carbonylation reaction to produce tertiary carbonic acid. Tertiary carbonic acid is a carboxylic acid with three alkyl groups connected to the alpha carbon atom, also known as trialkylacetic acid, and is an important organic chemical raw material. [0004] Mixed C from petroleum processing 4 Contains isobutene, n-butene, trans, cis-1-butene, n-, isobutane, related to C 4 There are many patents and articles on the polymerization of isobutylene in China, and most of them adopt the fixed bed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/08C07C2/38C07C11/02C07C11/12
Inventor 于在群贾颖华郝兴仁王光辉
Owner CHINA PETROLEUM & CHEM CORP
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